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Regulars are specific that snow is essentially gone from the city and coast by this point, spring flowers already blooming downtown, while the surrounding mountains stay genuinely buried - a real split within a short train ride of each other. Our row backs that transitional, still-cool read, 12.2C over 2.5C nights feeling -1C, with 39mm of rain across 6.4 days and a trace of late-season snow, 9.6cm, reflecting those higher-elevation totals rather than anything falling downtown. Regulars are consistent the weather itself stays genuinely unpredictable day to day, capable of a sunny, mild afternoon or a grey, wet one with little warning either way. Layers that can be added or shed, plus a proper waterproof outer layer, remain the standard packing advice. The record: humidity 70 percent, 10 hours of sun, a 13.8 kph wind and AQI 39.

Asked whether it can snow here in May, regulars say yes - they have seen everything from freezing and snowing to close to 30C in this month - and our row keeps 3.1cm in the snow column to prove the point. The averages are milder than that sounds: 18.2C by day reading as 16C, 7.7C nights that feel like 5C, and 58.9mm of rain across 9.1 days. What May reliably delivers is 17.2 hours of daylight with 11.8 of sun. The 17th is Constitution Day, when the parade starts at ten and the city becomes a street festival - the one date in the month worth planning around. The record: humidity 67 percent, a 14.2 kph wind and AQI 43.

Regulars give August in Oslo as 20 to 25C by day, occasionally reaching 30C, and are careful to correct a common expectation: this city sits well outside the Arctic Circle, so there is no midnight sun - what there is, is light until about eleven in the evening. Our row reads 21.7C over 12.8C with 15.5 hours of daylight. They also say the second half of August differs little from the first and that everything is still open, while September turns cooler, wetter and noticeably darker. Rain is part of it here at 110.5mm across 11.6 days. The record: humidity 79 percent, 9.9 hours of sun, a 13.8 kph wind and AQI 35.

July in Oslo is warm by Norwegian standards rather than by anyone else's - regulars are careful that hot here does not mean what it means further south, and note that the Oslo area peaks in the first fortnight of August, which is also when the water is warmest. Our row gives 23.8C days, 14C nights and nearly 18 hours of daylight. The question they get asked most is whether the city empties, and the answer is half-yes: most Norwegians are on holiday in July and it is quieter than May, but students stay on to keep things running and the tourists more than fill the gap. The record: 10.5 precipitation days carrying 84mm, humidity 73 percent and 12 hours of sun.